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technical subjects on soil fertility, soil an*lysis, soil an*lysis interpretation, fertilization, liming, crops in general, soil fertility, environment and sustainable agriculture. or in gardens, the goal is to know the amount per square meter (m²). in this case, the calculation is simply divide a. Note: Remember to transform the spacing in the meter unit. and mixed. when a simple fertilizer is marketed, the producing industry expresses a nutrient guarantee in percentage points that meets its guarantee recorded on the map. for example, superphosphate is marketed with an as*urance of 18%, this means that it has 18% p2O5. when an*lyzing this fertilizer it is common to present percentage variations, the soils of the Cerrados have high acidity and low contents of ca and mg. in the arable layer there is a poverty of bases and high levels of h and al. in this condition, the plants present problems in their development, because the root system formed is poorly developed and its roots absorb less water and nutrients. low productivity. the liming, in this case, becomes an imperative, because besides correcting the acidity, it adds to the soil ca and mg. the preference would be for one the incorporation of green fertilizers contributes to increase the mos means that there is a lot of carbon c) in relation to the nitrogen (n). in this case, soil microorganisms will deplete the reserves of harvested plant residues, plants must be cut before ripening, as the mineralization is greater when they are simple to determine as it depends on how they occur in the soil. a series of extractors are used to determine the solubility of phosphorus. therefore, soil an*lyzes are important for the recommendation of a correct fertilization. extractor solutions are used to evaluate the available p in the soil. a very used method of. starting from the quantities of raw materials, find a formulation.